[Fix] TS evolve breaks when no candidates

[joaquinco]

📑 Description

TS.OriginalTS.evolve raises an error when the list of candidate solutions is empty. This can occur when candidates are filtered out either because they are close to the current position or they are present in the tabu list.

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• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information